<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区 -->
      <div class="avatar_box">
        <img src="../assets/logo.png"
             alt="" />
      </div>
      <!-- 登录表单区 -->
      <el-form class="login_form"
               :model="form"
               :rules="rules"
               ref="loginFormRef">
        <!-- 用户名区 -->
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-yonghuming"
                    v-model="form.username"></el-input>
        </el-form-item>
        <!-- 密码区 -->
        <el-form-item prop="password">
          <el-input prefix-icon="iconfont icon-mima"
                    v-model="form.password"
                    type="password"></el-input>
        </el-form-item>
        <!-- 按钮区 -->
        <el-form-item class="btns">
          <el-button type="primary"
                     class="submit"
                     @click="login">登录</el-button>
          <el-button type="danger"
                     class="reset"
                     @click="loginFormReset">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 这是登陆表单双向绑定的数据
      form: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则对象
      rules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 8, message: '长度在 3 到 8 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置表单事件
    loginFormReset () {
      this.$refs.loginFormRef.resetFields()
    },

    // 表单登录之前的预验证
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        // 从json中抽出来data并重命名为res
        const { data: res } = await this.$http.post('/login', this.form)
        // console.log(res)
        if (res.meta.status !== 200) {
          // return console.log('fail')
          // 弹窗提示登录失败
          return this.$message.error('登录失败')
        }
        // console.log('success')
        // 弹窗提示登录成功
        this.$message.success('登录成功')
        // 将token存到sessionstorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 跳转到首页页面
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;

  .btns {
    display: flex;
    justify-content: center;
    .submit {
      margin-right: 20px;
    }
  }
}
</style>
